I recently performed this procedure successfully with very little effort, but it seems that this is difficult for some people to accomplish so I am posting it here with the hope that it will assist someone experiencing difficulty unlocking an AT&T phone.
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Obtain the IMEI Number from the phone
- Usually inside the battery compartment under the battery
- Alternate method is the go to the dialer on the phone and enter *#06# and it will disply the number on the screen
- Call +1 (800) 331-0500

- Ask the AT&T Representative to provide the unlock code for the phone
The phone must not be obligated to any current or expired contract for AT&T to provide the Unlock Code.
Besure to keep the unlock code for possible future use.